#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    string S, T;
    cin >> S >> T;
    int cntS[26] = {};
    int cntT[26] = {};
    rep(i, S.length()) cntS[S[i] - 'a']++;
    rep(i, T.length()) cntT[T[i] - 'a']++;
    rep(i, 26) {
        //dump(cntS[i]); dump(cntT[i]);
        if (cntS[i] != cntT[i]) {
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;

    return 0;
}